Liquidproof paper vessel



Jan. 8 1924.

E. W. LABOMBARDE LIQUID PROOF PAPER VESSEL Filed Sept. 2. 1921 20 1f 1214 V i 16 19 .ATTUl-F/VEY.

Patented Jan. 8, 1924.

ELIE W. LABOMIBARDE, OF NASHUA, NEW HEMPSHIRE.

LIQUIDPBOOF PAPER VESSEL.

Application filed. September 2, 1921. Serial No. 497,885.

To all whom it may concern:

Be it known that I, ELIE W. LABOM- BARDE, a citizen of the UnitedStates, and resident of Nashua, in the county of Hillsborough and Stateof New Hampshire,

have invented certain new and useful Improvements in Liquidproof PaperVessels, of which the following is a specification.

This invention relates to paper vessels or boxes to contain liquids suchas milk, or partly liquid substancessuch as oysters and pickles, and hasparticular reference to vessels or boxes made from flat blanks which,when folded, have flap portions glued together in overlappingrelationship.

Boxes of the general character referred to have been successfully usedfor holding and carrying ice cream which, being frozen, is not liable toescape until melted. Such boxes, for such substances, are usuallyemptied after a short period of time, and therefore it is not necessarythat they shall be very durable or capable of being more or less roughlyhandled for any material length of time.

The object of the present invention is to provide paper receptacleswhich are strong enough and so liquid-proof that they can be practicallyused for holding, without leakage, such li uid as milk, duringtransportation and de ivery to the consumers.

It is also an object of the invention to provide vessels of thischaracter which donot require localized application of the waterproofingsubstance, such as paraffine wax, in order to be able to adhesivelyconnect overlapping portions of the blanks.

Further objects are to provide liquidproof paper vessels which can besealed and 4 will remain sealed during transportation,

' and which can be readily opened when desired.

With these objects in view, my invention consists in the improved box orvessel, and in the improved blank therefor, substantially as hereinafterdescribed and claimed.

Of the accompanying drawings: Figure 1 is'a plan view of a blank cut andcreased to form one of my improved receptacles.

Figures 2, 3 and 4 are perspective views illustrating how the blank isfolded, p0I'- tions of each view being broken out to show interiorparts.

The particular form of blank illustrated in Figure 1 comprises a bottomsection 12, with flaps 13, 13, two wall sections 14, 15, one having sideflaps 16 and the other having side flaps 17. The wall section 14 has anend flap .18 and extension 19 thereof, and the wall section 15 has anend flap 20. The flaps 17 have extension flaps 21.

The material of which the blank is made consists of paper board by whichI mean sheet paper thick enough to contain in its interior suflicientwaterproofing material, such as' paraffine wax, to effectually preventthe passage of liquid such as milk, without relying upon any surfacecoating of the wax. Ordinary parafiined paper is quite thin, but issuccessfully used for wrappingpurposes. Its thinness howevernecessitates the presence of a coating of wax on one or both surfaces.This surface coating pre vents the adhesion of any well-known orordinary glue used for securing overlapping portions of the. blank orsheet. Any method employed for removing or preventing any surfacecoating on this thin paper would leave insufiicient wax in the fibers toenable a receptacle or box to be formed therefrom and be cap-able of usefor the transportation of milk. Therefore I employ paper board not onlyfor its strength but also because of its thickness, if filled with waxand having no surface coating, being capable of retaining enough wax toprevent leakage.

While the paper board may be treated as presently described before theblanks are cut therefrom, I prefer to cut the blanks first and thentreat them. This is because the cutting of the blanks leaves some smallpieces. As there is no economical way of reclaiming pieces of paperwhich carry parafline while the pieces can be used in the manufacture ofcheap grades of paper if they are clear of panafiine, it ismoreeconomical in the end to cut the blanks from un-waxed paper board andthen wax the blanks.

In preparing the paper board for use in making liquid-proof containers,whether said board is in the form of a web or large sheets or cut andcreased blanks such as shown in Figure 1, I employ a machine havingheated rolls with wax supplying means such as illustrated in LettersPatent 1,218,419, granted to me March 6, 1917. For present purposeshowever I employ nothing to prevent equal distribution of the wax on theentire surface or surfaces of the paper board. Preferably I employ twosets of heated rolls between which the paper board is passed under suchpressure that the wax is squeezed into the interior of the board beyondor away from both surfaces thereof. It is important that both surfacesof the boardshall be so free from wax that the glue used when the blankis folded will adhere to either surface, because flap portions of theblank are overlapped. In other words the parafline wax is driven awayfrom both surfaces of the board so glue will adhere firmly to anyportion thereof. At the same time the character of the board material issuch that it is capable of holding, below or within its surfaces,sufficient wax to enable a container made therefrom to hold liquidwithout leakage for such length of time as will be ample to cover theperiod from filling, through transporation, to the user.

When the blank illustrated, and made and treated as described, is to befolded, glue is first applied to certain portions thereof, as, forinstance, to those surfaces of the flaps 13, 13 and '17, 17, which, whenthe blank reaches the form shown in Figure 2 appear uppermost inthatfigure. Then, as the folding continues toward'the form shown in Figure3, the flaps 16, 16, pass inside the flaps 17 17 and the flaps 13, 13,are turnedup against the outside flaps 17 17. Whileso folded theoverlapping flaps are held under pressure for a sufficient length oftime to enable the glue to set. In practice I nest the articles (thetops, 18, 19, 20, 21 being left open) partly to aid in holding theglue-bearing flaps in contact and partly to reduce space required forstorage or shipment prior to filling them.

After one of the receptacles has been filled, the flap 18 is closed asshown in Figure 3, carrying the extension 19 with it. Said flap 18 is soproportioned that its lateral margins will come to rest on the upperedges of the wall flaps 16, 16, thereby limiting the downward movementof said flap 18 and preventing a splashing of the milk or other liquid.Then the flap 20 is folded downbetween the side flaps 21, 21, thismovement of the flap 20 bending the lip flap 19 backward and making atight joint along that fold. Next the side flaps 21, 21, are foldedtoward each other, said flaps being so proportioned that their edgessustantially meet flush. This folding of the flaps 21, 21 down flatbrings pressure upon the lateral margins of the flap 18 and practicallyclamps them on the upper edges of the wall flaps 16, 16, and efi'ectstight joints along said edges. Of course the fact that the material iscomparatively thick and strong has much to do with this efi'ecting oftight joints.

It now only remains to secure the flaps neeopes 21, 21, in their flatand clamping positions.

This is efiected by means of a gummed sealing strip 22 (Fig. 4) whichextends across the vessel so as to cover the crevice between the edgesof the flaps 21, 21, and to also extend part way down the front and rearWall sections. Any kind of gummed strip can be employed without risk ofthe gum affecting milk because there are. two complete layers of thepaper board material below the flaps 21, 21, viz: the flaps 18 and 20.

To open the container it is only necessary to rip the strip 22 away,which is easily effected. Then the flaps 21 and 20 can be lifted to theposition shown in Figure 3 which thus gives access to the lip flap 19.Said lip flap enables the user to lift the cover flap 18 as gently asmay be necessary to avoid undesirable agitation of the milk or cream.

In another application filed concurrently herewith, Serial No. 497,886,I have described and claimed means for making the corners of papervessels leak-tight, by means of corner patches. If desirable I may applysimilar patches to the blank illustrated and described herein, since thetreatment of the paper board here-inbefore explained is conducive to theeasy location of the patches in proper corner positions.

By the employment of the term paraffine or paraifine wax herein I do notlimit myself to that specific material as the liquidproofing substance,although I believe that material to be best for the purpose.

As shown in Figures 3 and 4, the flaps 13, 13, of the bottom section 12extend up outside of and are glued to the outer surface of tha outerwall portions 17 and they are nearly as wide as said portions 17. Thisgreatly strengthens the lower part of the receptacle and does notinterfere with close adherence of the portions 16 and 17. If the flaps13, 13, were to extend between the portions 16 and. 17, some areas ofthe latter would be held apart. And if the flaps 13, 13, were to extendup, inside the inner wall portions 16, they would prevent the interiorof the receptacle from having a smooth surface. The wall portions 16 and17 are of exactly the same width so that the edges of the portions 16extend closg in to the angles where the portions 1? meet the sections15, thereby lessening the liability of liquid passing around thevertical edges of the portions 16.

Having now described my invention, ll claim 1. The method of making aliquid-proof paper board Vessel, consisting in coating paper board withwax, subjecting said paper board to heat and pressure to drive the waxinto the fibers below both surfaces of the board and leave said surfacesin glue-holdingcondition, and then applying luerto portions of the boardand pressing t em 1n contact with other portions thereo 2. The method ofmaking a liquid-proof paperboard vessel, consisting in cutting a blankfrom aper board, applying wax to the blank and subjecting it to heat andpressure to drive the wax awa from both surfaces of the blank, and foling the blank to receptacle form with glue directly between overlappingportions thereof. I

3. The method of making liquid-proof vessels by folding paper boardstock and gluing overlapping portions'thereof together, characterized byapplying wax to the stock andremoving the wax from the surfaces into theinterior of the stock prior to the folding and gluing.

4. A paper board blank for making a D box, said blank of singlethickness bein interiorly impregnated with liquid-repe lant material,both surfaces of the blank being in condition to enable overlappingportions thereof to be glued together.

' ing overlapping 5. A liquid receptacle comprising a single thicknessofcpaper board out and creased to form a bottom section, wall sectionsand a plurality of flaps, said board being uniforml 'interiorlyimpregnated with wax and haviirg overlapping flaps glued together.

6. liquid receptacle comprising a foldedpiece of wax-impregnated paperboard having overlapping glued wall portions, 9. cover sectionproportioned to seat marginally on the upper edges of wall portions, andflapsto clamp said cover section in seated position. v y

7. A liquid receptacle comprising a folded piece of wax-' glued'wallportions, a cover section proportloned to seat marginally on the upperedges of wall portions, said cover section having a folded lip, andflaps to clamp said cover section in seated position.

- cover section mar mpregnated paper board hav-,

er section to ho d it in seated position.

9. A liquid receptacle comprising a folded piece of wax-impregnatedpaper board having overlapping glued wall portions, a cover sectionhaving a tioned to seat marginally on the upper e ges of wall portions,a flap foldable over the foldable lip and progorcover section and itslip, and two flaps extendin from the outer wall portions and foldab eover the flap which is to overlie the cover section.

10. A liquid receptacle comprising a folded piece of wax impregnatedpaper board having overlapping glued wall portions, a

inall bearing on the upper edges of the inner wall portions, a flapfolded over the cover section, portions having flaps folded toward eachother over the fla which overlies the cover section, and a sea ing stripfor securing together the said flaps of the outer wall portions.

11. A liquid receptacle comprising a folded piece. of wax-impregnatedpaper board having a bottom section and having overlapping glued wallportions, a foldable cover section, foldable flaps to overlie and holdthe cover section in position, and flaps of the bottom section foldedagainst the outer surfacesof the outer overlapping wall portions andglued thereto.

In testimony whereof I have aflixed my signature;

ELIE w. LABOMBARDE.

' Witnesses:

Ronnn'r HAMBLE'IT, Amnnn L. -GAUDE'1'1E.

the outer wall

